xcode 如何将音频文件从服务器下载到我的 iPhone 应用程序中？
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How to download audio files from a server into my iPhone application?
提问by 4slices
I have an iphone application which plays audio files (mp3) from a server, I want to add a download button so the user can download these files into the app. So he/she will not need the Internet connection each time they want to listen to these files. Does any one has a sample code for that ?
我有一个从服务器播放音频文件 (mp3) 的 iphone 应用程序，我想添加一个下载按钮，以便用户可以将这些文件下载到应用程序中。因此，他/她每次想要收听这些文件时都不需要 Internet 连接。有没有人有一个示例代码？
I saw many things on the web but I'm still confusion. Here is the code I'm using :
我在网上看到了很多东西，但我仍然很困惑。这是我正在使用的代码：
in the .h File :
在 .h 文件中：
#import
#import "MBProgressHUD.h"
#import
#import
@interface myViewController : UIViewController {
MBProgressHUD *HUD;
long long expectedLength;
long long currentLength;
AVAudioPlayer *theAudio;
}
-(NSString *)pathOfFile;
-(void)applicationWillTerminate:(NSNotification*)notification;
-(IBAction)play:(id)sender;
-(IBAction)download(id)sender;
@property (nonatomic,retain) AVAudioPlayer *theAudio;
in the .m File:
在 .m 文件中：
- (IBAction)download:(id)sender {
NSURL *URL = [NSURL URLWithString:@"http://www.server.com/myfile.mp3"];
NSURLRequest *request = [NSURLRequest requestWithURL:URL];
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
[connection start];
[connection release];
HUD = [[MBProgressHUD showHUDAddedTo:self.navigationController.view animated:YES] retain];
HUD.labelText = @"Loading...";
}
-(IBAction)play:(id)sender {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *file = [NSString stringWithFormat:@"%@/song.mp3", documentsDirectory];
theAudio = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:file] error:nil];
[theAudio play];
}
-(NSString *)pathOfFile {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
return [documentsDirectory stringByAppendingFormat:@"myfile.plist"];
}
-(void)applicationWillTerminate:(NSNotification*)notification {
NSMutableArray *array = [[NSMutableArray alloc]init];
[array addObject:theAudio];
[array writeToFile:[self pathOfFile] atomically:YES];
[array release];
}
I don't know what is the problem or what I'm missing over here , can you please help me with more details ? Thanks in advance.
我不知道是什么问题或我在这里遗漏了什么，你能帮我提供更多细节吗？提前致谢。
回答by Khalid Usman
Use ASIHTTP for downloading, it asynchronous and more reliable. http://allseeing-i.com/ASIHTTPRequest/This is the method through which you can download audios/videos. Pass parameter to it and start download?
使用ASIHTTP下载，异步更可靠。http://allseeing-i.com/ASIHTTPRequest/这是您可以下载音频/视频的方法。将参数传递给它并开始下载？
Parameters: (1) File Path , Document Directory path where you want to save (2) Trimmed String , which is the lecture URL
参数： (1) File Path ，要保存的文档目录路径 (2) Trimmed String ，即讲座网址
+ (void)downloadingLecture:(NSString *)filePath withLectureUrl:(NSString *)trimmedString
{
AppDelegate *_appDel=(AppDelegate *)[[UIApplication sharedApplication] delegate];
[_appDel.queue setDelegate:self];
[_appDel.queue setMaxConcurrentOperationCount:10];
[_appDel.queue setShouldCancelAllRequestsOnFailure:NO];
[_appDel.queue setShowAccurateProgress:YES];
ASIHTTPRequest *request;
request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:trimmedString]];
[request setDelegate:self];
[request setDownloadDestinationPath:filePath];
[request setShowAccurateProgress:YES];
[request setShouldContinueWhenAppEntersBackground:YES];
[request setUsername:downloadedSuccessfullString];
[request setDidFinishSelector:@selector(downloadedSuccessfully:)];
[request setDidFailSelector:@selector(downloadedFailure:)];
[_appDel.queue addOperation:request];
[_appDel.queue go];
}
Hope this will help you. If still issue then email me, I am sure I will do it, because I have implemented it in my two applications.
希望这会帮助你。如果问题仍然存在，请给我发电子邮件，我相信我会这样做，因为我已经在我的两个应用程序中实现了它。
回答by iDilip
Try below code:
试试下面的代码：
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:urlStr]];
[request setDownloadDestinationPath:destinationPath];
[request setTemporaryFileDownloadPath:[NSString stringWithFormat:@"%@-part",destinationPath]];
[request setDelegate:self];
[request setAllowResumeForFileDownloads:YES];
[request startAsynchronous];
And to check downloads:
并检查下载：
- (void)requestStarted:(ASIHTTPRequest *)request;
- (void)request:(ASIHTTPRequest *)request didReceiveResponseHeaders:(NSDictionary *)responseHeaders;
- (void)request:(ASIHTTPRequest *)request willRedirectToURL:(NSURL *)newURL;
- (void)requestFinished:(ASIHTTPRequest *)request;
- (void)requestFailed:(ASIHTTPRequest *)request;
Above code will create a file "your_file.mp3-part" in destination folder while download in progress and "your_file.mp3" when download completes.
上面的代码将在下载过程中在目标文件夹中创建一个文件“your_file.mp3-part”，并在下载完成时创建一个“your_file.mp3”。
Hope it helps. Let me know if any doubts.
希望能帮助到你。如果有任何疑问，请告诉我。
